Sand blast air washing



Dec. 20, 1932. F. .1. HULL SAND BLAST AIR WASHING Filed July 25. 1929 2 Sheets-Sheet SAND BLAST AIR WASHING Filed July 25, 1929 2 Sheets-Sheet 2 53$ f6! 63' I. M

6' gmntoz 6'8 V W. 66 I 68 2231:: M \TP z V?! I E i 8% {f -76 a T0 2 I I am" Patented Dec. 20, 1932 UNITED STATES,

PATENT OFFICE FOSTER J. HULL, OF HAGERSTOWN,-MARYLAND, ASSIGNOR TO PANGBORN CORPORA-;

TION, OF HAGERSTOWN, MARYLAND, A CORPORATION OF MARYLAND,

, SAND BLAST AIR WASHING Application filed July 25, 1929. Serial No. 380,785.

' The invention relates to that, branch of the sand blasting art in which, the operator, directing a stream of abrasive by meansof a nozzle fed by a hose, works in a chamber or other suitable enclosure which confines the abrasive particles and the dust resulting from the operation thereby preventing l11}111y t0 surrounding objects and discomfort and 111'- jury to individuals which-might result from the escape of the flying abrasive.

While the enclosure or chamber is a usual incident, it is not essential to the operative relation of the elements, features and comh1- nations of elements and features constituting the invention. In the sand blastingoperation thus identified the operator is protected from the flying abrasive and dust by a helmet which encloses the entire head and neck, making a contact with the operators shoulders sufliciently close to prevent the entrance of outside air, together with the dust and abrasive. In accordance with the practice to which the invention relates, a considerable volume of air is supplied to the helmet through an air hose at apressure considerably in excess of atmosphere. The bulk of this air is taken from the atmosphere outside the chamber.

The present invention relates to a washing apparatus whereby the air suppliedto the chamber from both sources'is relieved of all dust, grit and other solid particles suspended therein, the removal of the particles of solid matter being accomplished by passing the air through a body of water.

In the accompanying drawings I have illustrated the features of the invention in the preferred form.

In the drawings: r Figurel is a top plan view partially in section.

Figure 2 is a vertical central section on the line 1111 of Figure 1. I I Figure 3 is a fragmentary elevation looking from the right at the top portion of the air washer, Figure 2. i I Figure 4 is an elevation of an equalizing washer used in connection with the air washer yoke. p v

Figure 5 is a top plan of the same.

Referring to the illustration of theair washer, Figures land 2, the air washer 40 consists of a body member or main casting 41, which may be of'any suitable'material and produced in any convenient manner, and a cup 42. The cup is preferably of glass so that its contents can .be conveniently observed. This cup contains the wash water43. The cup may also be referred to as a sediment bulb or basin. The body casting 41 includes a dome or air chamber 44, which over lies the cup 42, being open downwardly into .the mouth of the cup at 48'. The cup may be secured to the body casting in any suitable manner. As shown, there is a soft packing f ring 46 seated in a groove 4 6, surrounding the opening 45, anda further depending skirt 47'surrounding the ring. The top edge of the cup 42 is shown as flared upwardly and Outwardly at 48. V c

The flared portion fits inside of the skirt, the top edge'or rim of thecup at 49comin'g in contact with the packing. The'cup is held in position in any convenient manner, the

preferred arrangement being hereinafter described, and it is further secured and its position is adjusted laterally by means of set screws 50 passed through theskirt into contact with the flared rim 47.

The cup 42 in the form of the inventionshown is supported and clamped in watertight relation to and with the main casting 41 by means of a yoke shown in section and in dotted lines in Figure 2. This yoke is a U shaped depending member, having inwardly disposed hooks 56, one at the upper end of each leg of the U, whichhooks engage a shoulder 57 on the main castinglat the top of the skirt 47 and in the form shown each hookis located in engaged position between two vertical webs 58 on the main casting 41.

In the form shown the cup 42'is provided with a draining aperture 60 atthe bottom, which aperture is, in the assembled form of the apparatus surrounded by a rubber gasket 61 which rests on the glass, pressed upwardly into watertight relation therewith by means of a plate 62, which is centrally 'apertured at 63 preferably in line with theapelfe ture 60. In the form shown the gasket 61 and the plate 62 are formed with interengaging shoulders and ribs 64, 65, 64 and 66, respectively. The plate 62 as shown is also formed with a ground or equivalent seat 67' surrounding the opening63 and there is a depending drain tube 68 cooperating witli the opening 63 and having an end surface 69 ground or otherwise formed to-engage the seat 67 which'may be ground or prepared in any suitable manner. The tubular member 68 is held with its end surface 69in liqa uid tight contact with the seat 67 by means of the yoke 55, which extends under the center of the cup. For this purposethe tube 68, which acts as a drain cock tube, is' threaded externally and passed through a suitable aperture 70 in the yoke, which aperture may be formed at the bottom of a socket 71 which in the form of the invention shown is formed in the yoke 1n line with the center of the cup. This socket, 111 turn, contains a rocker washer 73surrounding the drain tube 68 and resting on the bottom of the socket 71. This rockerwasher is shown in detail in Figures .tube, providing for motion of the tube relatively to the washer and the-hole 70 in the yoke fits loosely-about the tube. The thread on the tube is engaged by a nut 7 7, which fits down in the socket and bears on the ribs 7 6 of the rocker washer. Inthis way the drain tube 68 is given a certain freedom of motion relatively to the yoke and permitted to align itself soas to bring its end surface 69 into liquid; tight contact with the seat :67 as already pointed. out. Tightening of the nut forces the end of the tube 68 against the seat 67 and also forces the cup upwardly against the packing 46, the pressure being distributed by plate 62 and gasket 61;

A 'dr'aintube 681nay be provided at its lower end below the yoke with a drip cock. This drip cock provides for drawing the wash water 4 3 from the cup 42 whenever it becomes dirty or otherwise at the will of the operator, the new wash water beingintroduced through a clean water opening 79 in 'the wall of the chamber or dome 44, the

same being closed by ascrew'plug 80; 1

Another important feature of the apparatus resides in the arrangement ofthe body casting 41 in the vicini'ty of the sand blast chamber air pipe 82. Said pipe in the form of the invention-shown' is threaded into the casting 41 at the top'a'nd is protected from plied through the sand b'la'st chamber.

chamber or dome 44 in the form of the inv'ention shown contains an'intake air pipe 50, and

the spray which may be thrown up from the wash water bythe action of the airbymeans of a hood 83 surrounding the intake end 84 of said pipe. This hood is flared outwardly from the vicinity of said pipe and has an opening 85, preferably of a-transverse area equal to the entire end of the hood at its enlarged or flared end which is disposed toward the center of the chamber or dome 44. This hood, as to its bottom surface 86, is inclined downwardly and outwardly toward the center of the chamber and the opening is preferably flanged at 87, both of which formations serve to deflect the spray from the opening. To facilitate the separation of spray from the out going airpassag'e, the outer rim is inclined inwardly as to the lower portion thereof below the pipe84 and toward the bottom of surface 86, said inclined portion being indicated by reference character 88. This" hood is formed to act most efiiciently in deflecting the spray from the air which is sup- The an intake opening 51at the side and a depending discharge pipe 52 which is secured to the lower end of the air intake pipe 50 and extends downwardly into thecup in the line of the central axis of the same but the exact 10- cation and arrangement is not of primary importance. v The lower end of the discharge pipe at 53' is shown downwardly disposed and ce'ntralof the cup beneath the surface of the wash water 43.

The intake 51 is of peculiar and unusual construction, being formed with a mouth or inlet 52 in the form of a horizontal slot in the outer wall of the dome or chamber 41,". the intake 51 being continued in an upright direction from said slot, being preferably of a cross section substantially the same as the area of the .slot though the detail is not of controlling importance. connected by a small opening 53 with the illlet pipe 50 and there is an air pressure nozzle 54 seated in the wall of the chamberhaving its discharge openings in said intake 51,'the

same being immediately adjacent to and di-. rected through the small opening 53 into the inlet 50, being, however, spaced away from the walls of the intake and positioned so as to permit the free flow of air into the opening 53 from all directions in response to the injector action of the nozzle 54.

The arrangement of the nozzle 54 and the opening 53 opposite the nozzle, both being disposed at right angles to the greatest transverse dimension of the passage 51, and the inlet 52 directly through the face of the casting and the arrangement of the main air passage 50 and deflector 83 are details of importance in connection with the air washer element of the invention and to the construction of a cheap, eiii'cient and simple air washing The intake 51 is.,

device for the purposes in hand. It is further of interest that the body casting, 41, containing the dome or chamber44', can be cast in a single piece including the injector portions 51, 52 and 53, and the air passage 50, the mere screwing of the nozzle into a tapped hole in the casting serving to complete the injector.

In the sand blast operation in which this apparatus is used the workman directs the abrasive stream against the work by means of a nozzle, supplied with a mixture of abrasive and air under pressure by way of a hose. The operator, wearing a helmet, by which he is protected from abrasive and dust, is supplied with outside air by way of an air hose.

The supply of air to the hose is taken directly from outside, being propelled by air under pressure supplied to the nozzle 54, which is disposed directly at right angles to the greatest transverse dimension of the air inlet passage 51. The outside air is carried by the jet from the nozzle from passage 51 through opening 53 into and through the pipe 50 by which it is delivered beneath the surface of the wash water 43 and passed upward to the hose pipe 82, which'latter is protected from spray by the hood 83.

The sediment cup 42 being transparent,

the presence ofan excess'of sediment therein is easily observed. This sediment can ordinarily be discharged with the water by opening the dri 68 or the cup can, if necessary, be remove by loosening the nut 77 and swinging the yoke 55 to one side. The sediment having been thus removed and the receptacle replaced and/or closed, wash water may be introduced by way of opening 79.

The function of the rocker washer 7 3 which permits the drip tube 68 to ali itself with the round or otherwise pre erred cooperating surfaces 67 and 68 in close contact has been fully ex lained.

I have thus descri ed specifically and in detail an apparatus embodying my invention in the preferred form in order that the construction and manner of operation of the same may be clearly understood. However,

the specific terms herein are used descriptively rather than a limiting sense, the scope of the invnth defined in the claims.

Whatl; claim Q new and desire to secure y t er ,Pat nt l6 1. In asaRdbl t air washer having an air chambenwitliha lfopening at the a sediment c m novably secured thereto coverin sai opening, the air chamber having a ownwardly isposed air pipe near the center, an air passage leading from the outside to the vicinity of the upper end of said air pipe, said air passage being of extended lateral dimension, a reduced air opening connecting the top of said air pipe and said air passage and a pressure air nozzle di- :from, said chamber.

fre'cted across said=air pas'sa' eiand into said reduced 'openingztoward 'sa-i .-1air :pipe, which extends: down Iintof its sediment cup, the air :;-x 2 .-In ag sand blast air smasherv having an air chamberawith;"an, opening at; the bottom,

a; sedimentmup ;'removably gsecuredfl'thereto covering .saidopening, the; air chamber having a downwardly disposed air pipe-near air. pipe leading fijOIIf .the upper portion ;of

said 1 ;air chamber: and Ta hood- 7 surrounding the -samesto exclude? sprayifromsaid pi the, walls of said hoodbeing flaredoutwarI l V. ,Inafsand iblastiair jchamber with an opening at-the"bottom-, a''

sediment cup :removably secured theretocovit eringijsaid opening, .1 the air chamberhavingia downwardly disposed ai'r pipe near the center extending down into said cup,-.an-=-a-ir passage: leading from the outside toitl c. vi-

cinity of the upper end, of said. aijr pipe, said aitpassi e being of extended lateral dimension, a re uced air opening connecting the top of said air pipe and said air passage and a pressure air nozzle directed across said air passage and into said reduced opening toward said air pipe, a sand blast chamber air pipe leading'from the upper portion of said air chamber and a hood surrounding the same to'exclude spray from said pipe, the walls of said hood being flared outwardly from said chamber, and inclined downwardly and in- ;vardly toward the adjacent wall of the chamher having a downwardly disposed opening and a depending air pipe with means to supply the air thereto, a sediment cu secured to the chamber covering said opening, a yoke supporting the cup, the cup havi charge'opening at the bottom, a was er surrounding said opening and havin a downwardly disposed seat, a drip pipe aving its end formed to cooperate with said seat, and

the yoke being apertured to pass the ipe, a"

rocker member seated on the yoke an a nut engaging said drip pipe which is threaded to cooperate with the nut, the nut being adapted to be screwed down against the rocker washer to thrust the pipe upwardly a ainst the seat" providing for free alignment o the pipe with the seat.

4. In a sand blast air Washer, an a-irchama dis- 5. A sand blast air washer comprising an 1 air chamber and a sediment cup, the air chamher having a central downwardly disposed? Til." 1,891,855

air ipivbpassagb' of 'flatextended cross section, arreduced opening "cofinecting nidainm ptssxg-to mid-pm, threaded 1':

openipg' for' anfs ir nozzle in 'al igninentzwvith mid-redubflcpqning, t Wqtflsupp1y 0pendag, a thr'eaflehig'eningr for a-sand' "blast air pipe 11111112 1 protecting said opening, said chamber having 31% features cast in "a af-n'gle, iec'ei v r 6. T cvmbination in s; sand-"blast air washer of 'sn air'chamber having'uu ifijetor T17 1 imit a 'ddwnwardlyqfl-ispose'd "air pipe into which th iniefctbr discharges, th chumbr I I Upfi at'thebottbm and having a sediregistering with said opening, 'a

gupportextending'bemath tlw; cup; 2 drip pipe: thraade'd externally and having a ground fidfflll: cup being apemrred at the bottom in alignment. with "said pi e, .2 plate havin geaz: with" an cpeningta coopmte with thfi eiid' df the pipe,; a gasketb'etween "said an and s'aid plate; tha suppmrt being apertured to pass the pipe11ml ."fffifd upwardl into si-rtighvepntmt vwith the chamber w ich isprwidd with soft 1 "packingw ehguge the Signed by at fisgrstuwn, Maryland,

this 22nd day (if 6113x1929 

